Homework #9 (Ch. 21)
... Be careful about units! Please CIRCLE or put a box around your final answer if it is numerical. If you wish, you may discuss the questions with friends, but please turn in your own hand-written solutions, with questions answered in your own way. 1. Chaisson Review and Discussion 21.1 Under what circ ...
... Be careful about units! Please CIRCLE or put a box around your final answer if it is numerical. If you wish, you may discuss the questions with friends, but please turn in your own hand-written solutions, with questions answered in your own way. 1. Chaisson Review and Discussion 21.1 Under what circ ...
Progenitor and environment of the peculiar red nova V838 Mon
... years the system’s brightness was constant. After the outburst, we see photometric indications of a close approach and a collision of two components: first, brightening due to appearance of emission-line spectrum, then, an eclipse of B star observed for 70 days. ...
... years the system’s brightness was constant. After the outburst, we see photometric indications of a close approach and a collision of two components: first, brightening due to appearance of emission-line spectrum, then, an eclipse of B star observed for 70 days. ...
Introduction
... were from [O III ]. Nowadays, spectrographs show us that the spectrum of PNe is dominated by strong forbidden lines of metals and recombination lines of hydrogen and helium. As an example, the infrared spectrum (ISO-SWS) of the bright PN NGC 7027 is shown in Fig. 1.4. The spectrum is very rich in al ...
... were from [O III ]. Nowadays, spectrographs show us that the spectrum of PNe is dominated by strong forbidden lines of metals and recombination lines of hydrogen and helium. As an example, the infrared spectrum (ISO-SWS) of the bright PN NGC 7027 is shown in Fig. 1.4. The spectrum is very rich in al ...
... greatly increase the number of ions for which an electron temperature (Te ) can be found. This makes it possible to specify Te as a function of ionization potential (IP) of the ion concerned. This can be used for all observed ions, increasing the accuracy of the ionic abundances found. This has been ...
The Evening Sky Map
... Mean Time. USA Eastern Standard Time (for example, New York) is 5 hours behind UT. Variable Star – A star that changes brightness over a period of time. ...
... Mean Time. USA Eastern Standard Time (for example, New York) is 5 hours behind UT. Variable Star – A star that changes brightness over a period of time. ...
Aldebaran
... condense further and heat up. Nuclear reactions occurred when the temperature in the center of the protostar reached about 10 million degrees, and the star was born. Further expansion and heating of the star’s exterior then led to the formation of a red giant. This is what Aldebaran is now. Aldebara ...
... condense further and heat up. Nuclear reactions occurred when the temperature in the center of the protostar reached about 10 million degrees, and the star was born. Further expansion and heating of the star’s exterior then led to the formation of a red giant. This is what Aldebaran is now. Aldebara ...
The Astrophysical Origins of the Short
... star and enter the Solar System material shortly before, or soon after, Solar System formation: AGB star Contaminates Sun’s molecular cloud [wind possibly triggers collapse of cloud core] (Wasserburg et al. 1994) Nearby (Type II) Supernova ...
... star and enter the Solar System material shortly before, or soon after, Solar System formation: AGB star Contaminates Sun’s molecular cloud [wind possibly triggers collapse of cloud core] (Wasserburg et al. 1994) Nearby (Type II) Supernova ...
A brief review of double-pulsar system PSR J0737-3039
... Evolution of the double-pulsar system Consider a binary evolution scenario of two massive MS stars. After a first mass transfer stage, the primary (more massive star) form a NS in a core-collapse supernova (Type II) explosion. Under favorable conditions (small kick), the NS remains bound. As th ...
... Evolution of the double-pulsar system Consider a binary evolution scenario of two massive MS stars. After a first mass transfer stage, the primary (more massive star) form a NS in a core-collapse supernova (Type II) explosion. Under favorable conditions (small kick), the NS remains bound. As th ...
No Slide Title
... Pulsars are rapidly rotating neutron stars that have extremely large mass and magnetic fields, and spin precisely in time. Gravitational waves, proposed by Einstein, are thought to be created when large mass objects accelerate. Pulsar astronomers need additional observations of millisecond pulsars f ...
... Pulsars are rapidly rotating neutron stars that have extremely large mass and magnetic fields, and spin precisely in time. Gravitational waves, proposed by Einstein, are thought to be created when large mass objects accelerate. Pulsar astronomers need additional observations of millisecond pulsars f ...
Lec10_ch12_deathofstars
... What do you think? • Will the Sun end its existence? If so, how? – The Sun will shed its outer layers as a planetary nebula in about 7 billions years. Its remnant white dwarf, with fusion ceased, will dim over the next several billion years ...
... What do you think? • Will the Sun end its existence? If so, how? – The Sun will shed its outer layers as a planetary nebula in about 7 billions years. Its remnant white dwarf, with fusion ceased, will dim over the next several billion years ...
Star Formation in Bok Globules - European Southern Observatory
... is a huge, faintly luminous H 1I region spread over more than 30 degrees of the southern sky. At a distance of roughly 450 pc this corresponds to a radius of about 125 pc, making the Gum Nebula one of the largest structures known in our galaxy. Near its center are several objects which tagether prod ...
... is a huge, faintly luminous H 1I region spread over more than 30 degrees of the southern sky. At a distance of roughly 450 pc this corresponds to a radius of about 125 pc, making the Gum Nebula one of the largest structures known in our galaxy. Near its center are several objects which tagether prod ...
Letter to the Editor The formation of bipolar planetary nebulae
... and one might expect that this will have an effect on the formation of the nebula. A typical post-AGB track in the HR-diagram consists of two parts (Paczyński 1971). Initially the star contracts, evolving to higher effective temperatures at a constant luminosity; then as the energy production stops ...
... and one might expect that this will have an effect on the formation of the nebula. A typical post-AGB track in the HR-diagram consists of two parts (Paczyński 1971). Initially the star contracts, evolving to higher effective temperatures at a constant luminosity; then as the energy production stops ...
Image Analysis of Planetary Nebula NGC 6543 South Carolina State University
... infrared, ultra-violent and x-ray sources, yet, their brightness in the radio sources will decrease as a planetary nebula's ages and expands as well as become more diffuse. They have radii in the range of 0.2 to 3 light-years and an expansion rate of 10 to 20 km/s. The youngest planetary nebulae ar ...
... infrared, ultra-violent and x-ray sources, yet, their brightness in the radio sources will decrease as a planetary nebula's ages and expands as well as become more diffuse. They have radii in the range of 0.2 to 3 light-years and an expansion rate of 10 to 20 km/s. The youngest planetary nebulae ar ...
Anatomy of a Supernova - hrsbstaff.ednet.ns.ca
... cal combustion theory and terrestrial experiments show that In the late 1980s a new picture combined the strengths of there are two basic types of explosion. The first is called deflaboth models. Today scientists believe tbat a Type Ia supernova gration. Deflagration waves are subsonic and act like ...
... cal combustion theory and terrestrial experiments show that In the late 1980s a new picture combined the strengths of there are two basic types of explosion. The first is called deflaboth models. Today scientists believe tbat a Type Ia supernova gration. Deflagration waves are subsonic and act like ...
Neutron Stars PowerPoint
... • Basic physical process – Energy transferred to electrons from magnetic field • Similar to the Sun’s coronal heating ...
... • Basic physical process – Energy transferred to electrons from magnetic field • Similar to the Sun’s coronal heating ...
Word doc - UC-HiPACC - University of California, Santa Cruz
... Indeed, the supernovae were so distant that not only was light expanded in wavelength, but also time was dilated or expanded (per Einstein’s theory of relativity). That time dilation stretched out the duration of the event so that, as seen from telescopes on Earth, the explosions seemed to unfold in ...
... Indeed, the supernovae were so distant that not only was light expanded in wavelength, but also time was dilated or expanded (per Einstein’s theory of relativity). That time dilation stretched out the duration of the event so that, as seen from telescopes on Earth, the explosions seemed to unfold in ...
X-Ray Astronomy Poster_Final
... that of the V2 rockets available after World War II. With these, scientist revealed that Sun is a powerful source of UV and Xradiation. This is only because Sun is extremely close to us. But this discovery caused many scientist to lose interest in search for other sources of X-rays. Surprise Guest!! ...
... that of the V2 rockets available after World War II. With these, scientist revealed that Sun is a powerful source of UV and Xradiation. This is only because Sun is extremely close to us. But this discovery caused many scientist to lose interest in search for other sources of X-rays. Surprise Guest!! ...
High Precision Parallax Collecting Satellite
... Many a night I saw the Pleiads, rising thro’ the mellow shade Glitter like a swarm of fireflies, tangled in a silver braid. ...
... Many a night I saw the Pleiads, rising thro’ the mellow shade Glitter like a swarm of fireflies, tangled in a silver braid. ...
norfolk skies - Norfolk Astronomical Society
... On a cold night last January (1980), Dr. Scarr and I stumbled onto a beautiful little cluster of stars, just south of Sirius, in the constellation pf Canis Major. It's a very impressive little group, with about 3040 little 10th magnitude stars, all bunched up around this bright 4th magnitude star. A ...
... On a cold night last January (1980), Dr. Scarr and I stumbled onto a beautiful little cluster of stars, just south of Sirius, in the constellation pf Canis Major. It's a very impressive little group, with about 3040 little 10th magnitude stars, all bunched up around this bright 4th magnitude star. A ...
Gone in a flash: supernovae in the survey era
... until carbon burning is ignited at or near its core. These are the Type Ia supernovae (SNe Ia), with distinctive features of silicon (a product of carbon burning) in the spectra. The second group forms through the gravitational core-collapse of a massive star, more than eight times the mass of the S ...
... until carbon burning is ignited at or near its core. These are the Type Ia supernovae (SNe Ia), with distinctive features of silicon (a product of carbon burning) in the spectra. The second group forms through the gravitational core-collapse of a massive star, more than eight times the mass of the S ...
The Great Debate - The Story Behind The Science
... The significance of this rotational period requires understanding Shapley's size of the Milky Way. Shapley had been a supporter of the island universe idea until he determined the Milky Way to be 300,000 light-years in diameter (10x larger than the consensus estimate). He concluded this by measuring ...
... The significance of this rotational period requires understanding Shapley's size of the Milky Way. Shapley had been a supporter of the island universe idea until he determined the Milky Way to be 300,000 light-years in diameter (10x larger than the consensus estimate). He concluded this by measuring ...
Origin of the Solar System
... The works of Kant and Laplace are often referred to in common as the nebular hypothesis. It means that the Sun and the planets arose from the same formation process, more or less at the same time. However, there was no observational evidence or strict analytic proof that the model was correct, and t ...
... The works of Kant and Laplace are often referred to in common as the nebular hypothesis. It means that the Sun and the planets arose from the same formation process, more or less at the same time. However, there was no observational evidence or strict analytic proof that the model was correct, and t ...
Unraveling the Helix Nebula: Its Structure and Knots
... from an ionization front (although shock excitation is also possible in some regions, § 4.3). The knots begin to be observed at about the same distance from the central star that the HeII core gives way to the lower ionization H+ +He+ zone that produces the dominant [O III] emission. Throughout this ...
... from an ionization front (although shock excitation is also possible in some regions, § 4.3). The knots begin to be observed at about the same distance from the central star that the HeII core gives way to the lower ionization H+ +He+ zone that produces the dominant [O III] emission. Throughout this ...
Crab Nebula
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. It is not, as its name might suggest, in Cancer. The now-current name is due to William Parsons, 3rd Earl of Rosse, who observed the object in 1840 using a 36-inch telescope and produced a drawing that looked somewhat like a crab. Corresponding to a bright supernova recorded by Chinese astronomers in 1054, the nebula was observed later by English astronomer John Bevis in 1731. The nebula was the first astronomical object identified with a historical supernova explosion.At an apparent magnitude of 8.4, comparable to that of Saturn's moon Titan, it is not visible to the naked eye but can be made out using binoculars under favourable conditions. The nebula lies in the Perseus Arm of the Milky Way galaxy, at a distance of about 2.0 kiloparsecs (6,500 ly) from Earth. It has a diameter of 3.4 parsecs (11 ly), corresponding to an apparent diameter of some 7 arcminutes, and is expanding at a rate of about 1,500 kilometres per second (930 mi/s), or 0.5% c.At the center of the nebula lies the Crab Pulsar, a neutron star 28–30 kilometres (17–19 mi) across with a spin rate of 30.2 times per second, which emits pulses of radiation from gamma rays to radio waves. At X-ray and gamma ray energies above 30 keV, the Crab is generally the strongest persistent source in the sky, with measured flux extending to above 10 TeV. The nebula's radiation allows for the detailed studying of celestial bodies that occult it. In the 1950s and 1960s, the Sun's corona was mapped from observations of the Crab's radio waves passing through it, and in 2003, the thickness of the atmosphere of Saturn's moon Titan was measured as it blocked out X-rays from the nebula.